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The John J. Carroll Water Treatment Plant
Massachusetts Water Resources Authority

photo of John J. Carroll Water Treatment Plant

The John J. Carroll Water Treatment Plant is part of MWRA's Integrated Water Supply Improvement Program.

Date of start-up	The plant was successfully activated at 11:45 p.m., July 27, 2005.
Purpose	To treat drinking water for 2.3 million people in 41 Metropolitan Boston communities according to state and federal standards.
Water sources	Quabbin Reservoir and Wachusett Reservoir
>larger image
Capacity	275 million gallons per day, on an average day 405 million gallons per day, at peak level
Treatment Method	Ozonation for primary disinfection Chloramination for residual disinfection Corrosion control Fluoridation The plant has a modular design for treatment facility expansion, if needed
Ozone Facility Details	4 ozone generators, with diffusers 5 concrete contact chambers with a volume of 11.3 million gallons
Ozone generation tanks >larger image
Location	At the juncture of Marlborough, Northborough and Southborough, Massachusetts
Construction duration	March, 1999 - March 2005
Total budget for design and construction	$340 million
John J. Carroll Treatment Plant Construction November 2003 >larger image
Power	69 KV primary substation Backup generators on site
Site preparation	Over 400,000 cubic yards of earth were excavated to make a platform for the plant and to coordinate with construction of the MetroWest Water Supply Tunnel.
John J. Carroll Treatment Plant Tank Construction February, 2001 >larger image
Amount of concrete placed during construction	50,000 cubic yards
Total Number of People Who Worked on the Project	2,116 in design, engineering and construction
Maximum Number of People Working at One Time	280
Unions on the Job	Insulators and Asbestos Workers, Local 5 Boilermakers, Local 29 Bricklayers, Local 1 Bricklayers, Local 3 New England Regional Council of Carpenters I.B.E.W., Local 96 I.B.E.W., Local 103 Ironworkers, Local 57 Massachusetts District Council of Laborers Tunnel Workers, Local 88 Laborers, Local 243 Laborers, Local 609 Wreckers, Local 1421 Operating Engineers, Locals 4 and 4E Painters and Allied Traders District Council Plumbers and Pipe Fitters Local 4 Plumbers, Local 12, USA Roofers, Local 33 Sheet Metal Workers, Local 17 Sprinkler Fitters, Local 550, UA Sprinkler Fitters, Local 669, UA Teamsters, Local 170
Memorandums of Agreement with Communities	Marlborough Southborough Northborough
Designers	Camp, Dresser & McKee Barrientos, Wu and Associates, Inc. R.D. Kimball Company, Inc. Haley & ALdrich, Inc. Hazen & Sawyer, P.C. Judith Nitsch Engineering Rizzo Associates, Inc.
Construction Management Team	Earth Tech, Inc. Metcalf & Eddy, Inc. ASEC Corporation Coast & Harbor Associates, Inc. Regina Villa Associates, Inc. EMA, Inc. Corrosion Probe, Inc. Briggs Engineering and Testing
Major Contractors:	Barletta Heavy Division, Inc. Barletta/Shea, A Joint Venture Barletta Engineering Corp. J.F. White Contracting Co. United Gunite Construction, Inc. ROADS Corporation

PROJECT BACKGROUND:
Read a summary of the Treatment Technology Decision Court Trial (December 6, 1999 – February 17, 2000) > Link

Updated April 25, 2007